CN104776658A - Cold and hot water unit anti-freezing control method and device and cold and hot water unit - Google Patents
Cold and hot water unit anti-freezing control method and device and cold and hot water unit Download PDFInfo
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- CN104776658A CN104776658A CN201510167436.4A CN201510167436A CN104776658A CN 104776658 A CN104776658 A CN 104776658A CN 201510167436 A CN201510167436 A CN 201510167436A CN 104776658 A CN104776658 A CN 104776658A
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- preset time
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- heater unit
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- 238000000034 method Methods 0.000 title claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 238000007710 freezing Methods 0.000 title claims abstract description 30
- 239000003507 refrigerant Substances 0.000 claims abstract description 44
- 230000008014 freezing Effects 0.000 claims abstract description 27
- 230000002528 anti-freeze Effects 0.000 claims abstract description 23
- 238000005057 refrigeration Methods 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims description 20
- 230000008676 import Effects 0.000 claims description 14
- 230000000875 corresponding effect Effects 0.000 description 8
- 238000001704 evaporation Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/197—Pressures of the evaporator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
- F25B2700/21172—Temperatures of an evaporator of the fluid cooled by the evaporator at the inlet
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a cold and hot water unit anti-freezing control method, an anti-freezing control device and a cold and hot water unit. The antifreeze control method of the cold and hot water unit comprises the following steps: detecting the refrigerant inlet temperature T1 of the evaporator; detecting a compressor suction temperature T2; detecting the pressure P at any one of the air suction port of the compressor, the refrigerant inlet of the evaporator and the refrigerant outlet of the evaporator; after the refrigeration starting operation is carried out for the first preset time, if T1 is less than 0 ℃ and T2 is less than 0 ℃ or the pressure P is less than the preset pressure P1 in the continuous second preset time, the evaporator is judged to have the freezing risk. The invention jointly judges whether the evaporator has the freezing risk or not by detecting the refrigerant inlet temperature of the evaporator, the suction temperature of the compressor and the refrigerant pressure P, thereby avoiding the freezing problem of the heat exchanger possibly occurring during the refrigerating operation of the unit, simultaneously avoiding the error protection of the unit, improving the reliability and ensuring the safe and stable operation of the unit.
Description
Technical field
The present invention relates to water chiller-heater unit field, in particular to a kind of water chiller-heater unit antifreeze control method, freezing protection control device and water chiller-heater unit.
Background technology
Cold/heat is passed in recirculated water by water-fluorine heat exchanger by water chiller-heater unit, and then is delivered to user side realized refrigeration/heating function by water pump circulation.During unit operation, if improper use very easily causes evaporation side heat exchanger Inner eycle, water freezes at short notice and causes heat exchanger external shell or the bursting by freezing of internal heat pipeline, cause system failure even fluorine system water inlet and cause the miscellaneous part such as compressor to damage further, impact greatly.The many water inlet pipe and water outlet pipes by detecting heat exchanger of current technology, turnover refrigerant pipe judge whether heat exchanger water side exists and freeze risk, but cannot ensure accurately to judge and there is erroneous judgement and affect the problem that user uses.
Summary of the invention
The present invention aims to provide a kind of the water chiller-heater unit antifreeze control method, freezing protection control device and the water chiller-heater unit that improve reliability.
The invention provides a kind of water chiller-heater unit antifreeze control method, comprising: the ice-forming processes outside pipes T1 detecting evaporimeter; Detect compressor air suction temperature T2; Detect the pressure P at arbitrary place in refrigerant exit three place of the air entry of compressor, the refrigerant import of evaporimeter and evaporimeter; When after refrigeration start operation first Preset Time, if T1 < 0 DEG C in continuous second Preset Time, and T2 < 0 DEG C or pressure P < preset pressure P1, then judge that evaporimeter has and freeze risk.
Further, detected the pressure P at arbitrary place in refrigerant exit three place of the air entry of compressor, the refrigerant import of evaporimeter and evaporimeter by pressure switch, as the pressure P < preset pressure P1 that pressure switch detects, pressure switch is closed; When after refrigeration start operation first Preset Time, if when T1 < 0 DEG C and pressure switch are closed in continuous second Preset Time, then judge that evaporimeter has and freeze risk.
Further, preset pressure P1 is-5 DEG C to-10 DEG C corresponding refrigerant saturation pressure force value.
Further, the first Preset Time is 1min to 4min, and the second Preset Time is 20s to 60s.
Present invention also offers a kind of water chiller-heater unit antifreeze control method, comprising: the ice-forming processes outside pipes T1 detecting evaporimeter, and detect compressor air suction temperature T2; Or detect the ice-forming processes outside pipes T1 of evaporimeter, and detect the pressure P at arbitrary place in refrigerant exit three place of the air entry of compressor, the refrigerant import of evaporimeter and evaporimeter; When after refrigeration start operation first Preset Time, if T1 < 0 DEG C and T2 < 0 DEG C in continuous second Preset Time, then judge that evaporimeter has and freeze risk; Or when after refrigeration start operation first Preset Time, if T1 < 0 DEG C and pressure P < preset pressure P1 in continuous second Preset Time, then judge that evaporimeter has and freeze risk.
Present invention also offers a kind of water chiller-heater unit freezing protection control device, comprising: the first temperature-detecting device, for detecting the ice-forming processes outside pipes T1 of evaporimeter; Second temperature-detecting device, for detecting compressor air suction temperature T2; Pressure-detecting device, for detect the air entry of compressor, the refrigerant import of evaporimeter and evaporimeter refrigerant exit three place in the pressure P at arbitrary place; Control device, for after refrigeration starts shooting operation first Preset Time, if T1 < 0 DEG C in continuous second Preset Time, and T2 < 0 DEG C or pressure P < preset pressure P1, then judge that evaporimeter has and freeze risk.
Further, pressure-detecting device is pressure switch, and as pressure P < preset pressure P1, pressure switch is closed.
Further, preset pressure P1 is-5 DEG C to-10 DEG C corresponding refrigerant saturation pressure force value.
Further, the first Preset Time is 1min to 4min, and the second Preset Time is 20s to 60s.
Present invention also offers a kind of water chiller-heater unit freezing protection control device, comprise the first temperature-detecting device, for detecting the ice-forming processes outside pipes T1 of evaporimeter; Freezing protection control device also comprises the second temperature-detecting device, for detecting compressor air suction temperature T2; Or also comprise pressure-detecting device, for detect the air entry of compressor, the refrigerant import of evaporimeter and evaporimeter refrigerant exit three place in the pressure P at arbitrary place; Control device, for when after refrigeration start operation first Preset Time, if T1 < 0 DEG C and T2 < 0 DEG C in continuous second Preset Time, then judges that evaporimeter has and freezes risk; Or when after refrigeration start operation first Preset Time, if T1 < 0 DEG C and pressure P < preset pressure P1 in continuous second Preset Time, then judge that evaporimeter has and freeze risk.
Present invention also offers a kind of water chiller-heater unit, comprise aforesaid freezing protection control device.
According to water chiller-heater unit antifreeze control method of the present invention, freezing protection control device and water chiller-heater unit; by detecting the ice-forming processes outside pipes of evaporimeter, compressor air suction temperature and refrigerant pressure P; combine and judge whether evaporimeter has and freeze risk; thus the heat exchanger frozen problem that may occur when avoiding unit refrigerating operaton; avoid unit protection by mistake simultaneously, improve the stable operation of Reliability Assurance unit safety.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the principle schematic according to water chiller-heater unit antifreeze control method of the present invention;
Fig. 2 is the principle schematic according to water chiller-heater unit of the present invention.
Description of reference numerals:
1, evaporimeter; 2, compressor; 3, the first temperature-detecting device; 4, the second temperature-detecting device; 5, pressure-detecting device.
Detailed description of the invention
Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
First embodiment of water chiller-heater unit antifreeze control method of the present invention is described shown in composition graphs 1 and Fig. 2, and in this embodiment, antifreeze control method comprises: the ice-forming processes outside pipes T1 detecting evaporimeter; Detect compressor air suction temperature T2; Detect the pressure P at arbitrary place in refrigerant exit three place of the air entry of compressor, the refrigerant import of evaporimeter and evaporimeter; When after refrigeration start operation first Preset Time, if T1 < 0 DEG C in continuous second Preset Time, and T2 < 0 DEG C or pressure P < preset pressure P1, then judge that evaporimeter has and freeze risk.The present invention is by detecting the ice-forming processes outside pipes of evaporimeter, compressor air suction temperature and refrigerant pressure P; combine and judge whether evaporimeter has and freeze risk; thus the heat exchanger frozen problem that may occur when avoiding unit refrigerating operaton; avoid unit protection by mistake simultaneously, improve the stable operation of Reliability Assurance unit safety.
Preferably, by pressure switch detected pressures P, the closing pressure regulating pressure switch is preset pressure P1, thus when making the pressure P < preset pressure P1 when pressure switch detects, pressure switch is closed; Namely when after refrigeration start operation first Preset Time, if when T1 < 0 DEG C and pressure switch are closed in continuous second Preset Time, then judge that evaporimeter has and freeze risk.
Usually, after judging that evaporimeter has and freezes risk, the corresponding action device that avoids evaporating can be adopted to freeze, and such as close compressor also reports fault.Preferably, in order to improve reliability further, preset pressure P1 is generally-5 DEG C to-10 DEG C corresponding refrigerant saturation pressure force value.First Preset Time is generally 1min to 4min, namely ensures that unit reliably starts, and after stable operation, then start to detect judgement; Second Preset Time is 20s to 60s, and the second Preset Time is too short, likely occurs erroneous judgement, and cause protection by mistake, the second Preset Time is long, likely occurs responding slow and causing freezing.Thus, the second suitable Preset Time is set, protection by mistake can be avoided, improve reliability.Preferably, the second Preset Time is 30s.
In the second embodiment of water chiller-heater unit antifreeze control method of the present invention, with the first embodiment unlike, in a second embodiment, antifreeze control method comprises: detect the ice-forming processes outside pipes T1 of evaporimeter, and detect compressor air suction temperature T2; When after refrigeration start operation first Preset Time, if T1 < 0 DEG C and T2 < 0 DEG C in continuous second Preset Time, then judge that evaporimeter has and freeze risk.Namely judge whether to have by detection ice-forming processes outside pipes T1 and compressor air suction temperature T2 temperature and freeze risk; avoid the heat exchanger frozen problem that may occur during unit refrigerating operaton; avoid unit protection by mistake simultaneously, improve the stable operation of Reliability Assurance unit safety.In a second embodiment, the first Preset Time and the second Preset Time, and arrange identical in the first embodiment, repeat no more.
In the 3rd embodiment of water chiller-heater unit antifreeze control method of the present invention, with the first embodiment unlike, in the third embodiment, antifreeze control method comprises: detect the ice-forming processes outside pipes T1 of evaporimeter, and detects the pressure P at arbitrary place in refrigerant exit three place of the air entry of compressor, the refrigerant import of evaporimeter and evaporimeter; When after refrigeration start operation first Preset Time, if T1 < 0 DEG C and pressure P < preset pressure P1 in continuous second Preset Time, then judge that evaporimeter has and freeze risk.Namely combined by ice-forming processes outside pipes and refrigerant pressure P and judge whether evaporimeter has and freeze risk, thus the heat exchanger frozen problem that may occur when avoiding unit refrigerating operaton, avoid unit protection by mistake simultaneously, improve the stable operation of Reliability Assurance unit safety.In the third embodiment, optimum configurations is identical in the first embodiment, repeats no more.
Present invention also offers a kind of freezing protection control device corresponding with the antifreeze control method of the first embodiment, comprising: the first temperature-detecting device 3, for detecting the ice-forming processes outside pipes T1 of evaporimeter 1; Second temperature-detecting device 4, for detecting compressor 2 suction temperature T2; Pressure-detecting device 5, for detect the air entry of compressor, the refrigerant import of evaporimeter and evaporimeter refrigerant exit three place in the pressure P at arbitrary place; Control device, for after refrigeration starts shooting operation first Preset Time, if T1 < 0 DEG C in continuous second Preset Time, and T2 < 0 DEG C or pressure P < preset pressure P1, then judge that evaporimeter has and freeze risk.
Usually, the first temperature-detecting device 3 and the second temperature-detecting device 4 adopt temperature sensor.Pressure-detecting device 5 adopts pressure switch, and as pressure P < preset pressure P1, pressure switch is closed, and preset pressure P1 generally adopts-5 DEG C to-10 DEG C corresponding refrigerant saturation pressure force value.Control device is the control mainboard of unit, and the first temperature-detecting device 3, second temperature-detecting device 4 and pressure-detecting device 5 are all connected with control mainboard.First Preset Time is 1min to 4min, and the second Preset Time is 20s to 60s.
Present invention also offers a kind of freezing protection control device corresponding with the antifreeze control method of the second embodiment, comprise the first temperature-detecting device 3, for detecting the ice-forming processes outside pipes T1 of evaporimeter; Second temperature-detecting device 4, for detecting compressor air suction temperature T2; Control device, for when after refrigeration start operation first Preset Time, if T1 < 0 DEG C and T2 < 0 DEG C in continuous second Preset Time, then judges that evaporimeter has and freezes risk.
Present invention also offers a kind of freezing protection control device corresponding with the antifreeze control method of the 3rd embodiment, the first temperature-detecting device 3, for detecting the ice-forming processes outside pipes T1 of evaporimeter; Pressure-detecting device 5, for detect the air entry of compressor, the refrigerant import of evaporimeter and evaporimeter refrigerant exit three place in the pressure P at arbitrary place; Control device, for when after refrigeration start operation first Preset Time, if T1 < 0 DEG C and pressure P < preset pressure P1 in continuous second Preset Time, then judges that evaporimeter has and freezes risk.
Present invention also offers a kind of water chiller-heater unit, comprise aforesaid freezing protection control device, thus ensure that unit reliability runs.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect:
According to water chiller-heater unit antifreeze control method of the present invention, freezing protection control device and water chiller-heater unit; by detecting the ice-forming processes outside pipes of evaporimeter, compressor air suction temperature or refrigerant pressure P; combine and judge whether evaporimeter has and freeze risk; thus the heat exchanger frozen problem that may occur when avoiding unit refrigerating operaton; avoid unit protection by mistake simultaneously; improve reliability, ensure unit safety stable operation.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a water chiller-heater unit antifreeze control method, is characterized in that, comprising:
Detect the ice-forming processes outside pipes T1 of evaporimeter;
Detect compressor air suction temperature T2;
Detect the pressure P at arbitrary place in the air entry of described compressor, the refrigerant import of described evaporimeter and refrigerant exit three place of described evaporimeter;
When after refrigeration start operation first Preset Time, if described T1 < 0 DEG C in continuous second Preset Time, and described T2 < 0 DEG C or described pressure P < preset pressure P1, then judge that described evaporimeter has and freeze risk.
2. water chiller-heater unit antifreeze control method according to claim 1, is characterized in that,
The pressure P at arbitrary place in refrigerant exit three place of the air entry of described compressor, the refrigerant import of described evaporimeter and described evaporimeter is detected by pressure switch, as the pressure P < preset pressure P1 that described pressure switch detects, described pressure switch is closed;
When after refrigeration start operation first Preset Time, if when described T1 < 0 DEG C and described pressure switch are closed in continuous second Preset Time, then judge that described evaporimeter has and freeze risk.
3. the water chiller-heater unit antifreeze control method according to claims 1 or 2, is characterized in that, described preset pressure P1 is-5 DEG C to-10 DEG C corresponding refrigerant saturation pressure force value.
4. the water chiller-heater unit antifreeze control method according to claims 1 or 2, is characterized in that,
Described first Preset Time is 1min to 4min, and described second Preset Time is 20s to 60s.
5. a water chiller-heater unit antifreeze control method, is characterized in that, comprising:
Detect the ice-forming processes outside pipes T1 of evaporimeter; And the pressure P at arbitrary place in refrigerant exit three place detected compressor air suction temperature T2 or detect the air entry of described compressor, the refrigerant import of described evaporimeter and described evaporimeter;
When after refrigeration start operation first Preset Time, if described T1 < 0 DEG C and described T2 < 0 DEG C in continuous second Preset Time, then judge that described evaporimeter has and freeze risk; Or when after refrigeration start operation first Preset Time, if described T1 < 0 DEG C and described pressure P < preset pressure P1 in continuous second Preset Time, then judge that described evaporimeter has and freeze risk.
6. a water chiller-heater unit freezing protection control device, is characterized in that, comprising:
First temperature-detecting device, for detecting the ice-forming processes outside pipes T1 of evaporimeter;
Second temperature-detecting device, for detecting compressor air suction temperature T2;
Pressure-detecting device, for detect the air entry of described compressor, the refrigerant import of described evaporimeter and described evaporimeter refrigerant exit three place in the pressure P at arbitrary place;
Control device, for after refrigeration starts shooting operation first Preset Time, if described T1 < 0 DEG C in continuous second Preset Time, and described T2 < 0 DEG C or described pressure P < preset pressure P1, then judge that described evaporimeter has and freeze risk.
7. water chiller-heater unit freezing protection control device according to claim 6, is characterized in that,
Described pressure-detecting device is pressure switch, and as pressure P < preset pressure P1, described pressure switch is closed.
8. the water chiller-heater unit freezing protection control device according to claim 6 or 7, is characterized in that, described preset pressure P1 is-5 DEG C to-10 DEG C corresponding refrigerant saturation pressure force value.
9. the water chiller-heater unit freezing protection control device according to claim 6 or 7, is characterized in that,
Described first Preset Time is 1min to 4min, and described second Preset Time is 20s to 60s.
10. a water chiller-heater unit freezing protection control device, is characterized in that, comprises the first temperature-detecting device, for detecting the ice-forming processes outside pipes T1 of evaporimeter; Described freezing protection control device also comprises the second temperature-detecting device, for detecting compressor air suction temperature T2; Or also comprise pressure-detecting device, for detect the air entry of described compressor, the refrigerant import of described evaporimeter and described evaporimeter refrigerant exit three place in the pressure P at arbitrary place;
Control device, for when after refrigeration start operation first Preset Time, if described T1 < 0 DEG C and described T2 < 0 DEG C in continuous second Preset Time, then judges that described evaporimeter has and freezes risk; Or when after refrigeration start operation first Preset Time, if described T1 < 0 DEG C and described pressure P < preset pressure P1 in continuous second Preset Time, then judge that described evaporimeter has and freeze risk.
11. 1 kinds of water chiller-heater unit, comprise freezing protection control device, it is characterized in that, the freezing protection control device of described freezing protection control device according to any one of claim 6 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510167436.4A CN104776658A (en) | 2015-04-09 | 2015-04-09 | Cold and hot water unit anti-freezing control method and device and cold and hot water unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510167436.4A CN104776658A (en) | 2015-04-09 | 2015-04-09 | Cold and hot water unit anti-freezing control method and device and cold and hot water unit |
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| CN104776658A true CN104776658A (en) | 2015-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510167436.4A Pending CN104776658A (en) | 2015-04-09 | 2015-04-09 | Cold and hot water unit anti-freezing control method and device and cold and hot water unit |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106288245A (en) * | 2015-11-05 | 2017-01-04 | 广东志高暖通设备股份有限公司 | A kind of water machine antifreeze control method, system and air-conditioning equipment |
| CN107525297A (en) * | 2017-08-22 | 2017-12-29 | 广东美的暖通设备有限公司 | Antifreeze control method, constant speed air-conditioning system and storage medium |
| CN107906811A (en) * | 2017-10-12 | 2018-04-13 | 青岛海尔空调电子有限公司 | The anti-refrigeration control method of heat pump unit |
| CN112902517A (en) * | 2019-12-04 | 2021-06-04 | 广东芬尼克兹节能设备有限公司 | Anti-freezing control method, device and equipment for variable frequency heat pump and storage medium |
| CN112984879A (en) * | 2021-03-03 | 2021-06-18 | 广东芬尼克兹节能设备有限公司 | Fluorine road anti-freezing control method, device, equipment and storage medium |
| CN113899052A (en) * | 2020-06-22 | 2022-01-07 | 广东美的制冷设备有限公司 | Anti-freezing control method, operation control device and multi-split system |
| CN113932399A (en) * | 2020-07-13 | 2022-01-14 | 广东美的暖通设备有限公司 | Anti-freezing control method and device, cold and hot water machine and computer storage medium |
| CN114087747A (en) * | 2020-07-30 | 2022-02-25 | 广东美的暖通设备有限公司 | Control method and control device of air conditioning system, controller and air conditioning system |
| CN115789963A (en) * | 2022-12-05 | 2023-03-14 | 珠海格力电器股份有限公司 | Heat pump hot water unit and water leakage detection method and detection device thereof |
| CN115823786A (en) * | 2022-12-08 | 2023-03-21 | 珠海格力电器股份有限公司 | Unit anti-freezing control method and device and water chilling unit |
| CN116558144A (en) * | 2023-06-28 | 2023-08-08 | 荏原冷热系统（中国）有限公司 | Judgment method for anti-freezing pipe of evaporator of lithium bromide absorption refrigerator |
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